fill patter

[Etienne Low-Decarie]

Is there any way to use a pattern rather than a colour for mapping fill?  I have recently encountered difficulty presenting data to colour blind people and in printing in black and white.

Along the lines of what is available in gridExtra:

grid.pattern(x=seq(1/6, 5/6, length=6), width=unit(1/8,"npc"), height=unit(0.5,"npc"),

+              motif.width=unit(10, "mm"),  pattern=c(1:6), orientation=45, motif.alpha=0.5,

+              motif.cex=c(1, 0.5), motif.col=1:2, motif.fill=NA,

+              gp=gpar(fill="blue", lwd=2, alpha=0.5),  clip=TRUE)

Thank you,

Etienne

[baptiste auguie]

AFAIK there's no such possibility with ggplot2 (or grid graphics, really), probably because no-one sees it as a worthwhile feature to implement. If you absolutely need fill patterns, your best bet might be to have a go at processing the plot in svg format which natively supports fill patterns with arbitrary clipping (gridSVG has tools for such processing, it should work in theory with reasonably low effort).

HTH,

b.

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